I have been using my 35mm Pentax in the horiz format and cropping the sides in printing to create square images. Was wondering if anyone knows how easy or difficult it is (or of it is even possible) to modify a body to not advance the film as far, thus enabling more shots on a roll of film. I would assume if it could be done at all, the more basic a camera was, the better (no problem with that). I currently have a Pentax P3 with a manual film advance lever. Again, I don't mind shooting the way I do know but I assume I could get almost 50 shots on a 36 exp roll if it could be done.